# Capacitors

mcqspedia.com has 49 Question/Answers about Topic Capacitors

## The term ______ is derived from a mathematical function in calculus.

- A. differentiator
- B. integrator
- C. filter
- D. voltage-divider
- Correct Answer: Option B

## A discharged capacitor has ______ charges on its plates.

- A. no
- B. unequal
- C. equal
- D. negative
- Correct Answer: Option C

## A circuit whose output voltage is proportional to the rate of change of the input voltage is called a(n) ______ .

- A. differentiator
- B. integrator
- C. curve averager
- D. mixer
- Correct Answer: Option A

## A resistor and an output capacitor form a series circuit with a square wave applied. The circuit is:

- A. an integrator
- B. a differentiator
- C. a multiplier
- D. a divider
- Correct Answer: Option A

## A capacitor and an output resistor form a series circuit with a square wave applied. The circuit is:

- A. an integrator
- B. a differentiator
- C. a multiplier
- D. a divider
- Correct Answer: Option B

## In an ac circuit, a capacitor and an output resistor are connected in series with an ac signal. What filter action will be the result?

- A. bandpass
- B. low-pass
- C. high-pass
- D. band-stop
- Correct Answer: Option C

## In an ac circuit, an output capacitor and a resistor are connected in series with an ac signal. What filter action will be the result?

- A. bandpass
- B. low-pass
- C. high-pass
- D. band-stop
- Correct Answer: Option B

## What is wrong with a leaky capacitor?

- A. It is open.
- B. It is shorted.
- C. The dielectric resistance has increased.
- D. The dielectric resistance has decreased.
- Correct Answer: Option D

## If an open capacitor is checked with an ohmmeter, the needle will:

- A. stay on zero
- B. stay on infinity
- C. move from zero to infinity
- D. move from infinity to zero
- Correct Answer: Option B

## What is the total current for a 5 MHz, 1 Vac circuit that consists of a 27 pF capacitor and a 1 k resistor connected in parallel?

- A. 459 A
- B. 647 A
- C. 1.31 mA
- D. 1.85 mA
- Correct Answer: Option C

## What is the impedance of an ac RC parallel circuit if the resistance is 12 ohms and the capacitive reactance equals 5 ohms?

- A. 0.2 ohms
- B. 3.5 ohms
- C. 4.6 ohms
- D. 13 ohms
- Correct Answer: Option C

## What is the power factor if the apparent power of a circuit is 5 W, while the true power is 4 W?

- A. 0.0 W
- B. 0.8 W
- C. 1.0 W
- D. 1.25 W
- Correct Answer: Option B

## If the reactive power of a circuit is 50 mW while the apparent power is 64 mW, then what is the true power of the circuit?

- A. 14 mW
- B. 36 mW
- C. 40 mW
- D. 114 mW
- Correct Answer: Option C

## Power stored from the source and then returned to the source is called:

- A. apparent power
- B. impedance power
- C. reactive power
- D. true power
- Correct Answer: Option C

## What is the angle theta value for a 5.6 F capacitor and a 50-ohm resistor in series with a 1.1 kHz, 5 Vac source?

- A. 27.3 degrees
- B. 62.7 degrees
- C. –27.3 degrees
- D. –62.7 degrees
- Correct Answer: Option C

## If a current of 40 mA flows through a series circuit consisting of a 0.4 F capacitor and a resistor in series with a 4 kHz, 40 Vac source, what is the total circuit impedance?

- A. 10
- B. 100
- C. 1 k
- D. 1 M
- Correct Answer: Option C

## What is the impedance of a series RC circuit that consists of a 0.22 F capacitor and a 200-ohm resistor connected to a 3 kHz source?

- A. 214 ohms
- B. 313 ohms
- C. 414 ohms
- D. 880 ohms
- Correct Answer: Option B

## What is the total opposition to current in a series RC circuit called?

- A. impedance
- B. inductance
- C. reactance
- D. resistance
- Correct Answer: Option A

## In a 20 Vac series RC circuit, if 20 V is measured across the resistor and 40 V is measured across the capacitor, the applied voltage is:

- A. 45 V
- B. 50 V
- C. 55 V
- D. 60 V
- Correct Answer: Option A

## With a 500 kHz signal source, what would be the value of a capacitor yielding a capacitive reactance of 1 k ?

- A. 318 pF
- B. 2 nF
- C. 3.18 F
- D. 2 F
- Correct Answer: Option A